Why is the Single-Dose COVID vaccine from Johnson & Johnson Morally Objectionable?
The vaccine from Johnson & Johnson uses the direct products of a commercially available human stem cell line which was derived from a fetus aborted many years ago. Unlike the vaccines released to market so far which only used morally objectionable materials in testing their vaccine, the Johnson and Johnson vaccine uses that very stem cell line to manufacture the vaccine.
The Vatican and bishops have concluded that the other vaccines cooperate with evil (the evil of abortion) only remotely, whereas the cooperation of the new vaccine with the original abortion is more direct, hence illicit.
The USCCB has recommended that Catholics who have a choice of vaccine should elect an alternative to the Johnson & Johnson single-dose vaccine.
Statement from the USCCB here.